Adjustable roof jack



June '9., 1942. v

J. J. INGRAM MJJUSmams: ROOF JACK Fil-ed Feb. 17, 1941 Patented June 9, 1942 UNITED STATES PATENT OFFICE ADJUSTABLE Roor JACK Joseph J. Ingram, Portland, Oreg. Application February 17, 1941,4Serial` No. 379,382

3 Claims. (Cil. 304,-20') My invention relates to adjustable roof jacks.

It has for its primary purpose and object the construction of a device that is adapted for use on roofs of different pitches.

A further object of the device is to provide a jack that may be folded when not in use to compact the same into a minimum of space.

A further object of the device is to so construct the same as to provide a locking of the seat of the jack in raised position and one that may not prematurely become unlocked to thereby render the same dangerous to the user thereof.

A further object of the invention is to so construct the roof contacting base members so that the same willy span the weather ends of the shingles disposed between the contacting surfaces of the base with the roof to thereby further increase the stability of the device when in place upon the roof.

With these and incidental objects in View, the invention consists in certainl novel features of construction and combination of parts, the essential elements of which are set forth in the appended claims, and a preferred form of embodiment of which is hereinafter shown with reference to the drawing which accompanies and forms a part of this specication.

In the drawing:

Fig. I is a side view of my new and improved jack shown in place and in position upon a roof and showing the same as being occupied by the user.

Fig. II is an end View of the jack shown in raised position.

Fig. III is a sectional side view of the assembled device as shown removed from the roof.

Fig. IV is a plan view of the roof jack shown in full folded position.

Fig. V is a fragmentary sectional side view of the locking bolt shown in locking position Within one of the base bar members.

Fig. VI is a fragmentary partially sectional side view of the central part of the locking member illustrating the lever in place for moving the locking bars.

Like reference characters refer to like parts throughout the several views.

I provide two base bar members I and 2. The

base bar members are offset at 3 and 4. The oliset is sufficient to span the Weather ends of the shingles disposed between the offsets as illustrated at 5.

Teeth 6 are provided in the top end of the base bar and teeth 'I are provided in the bottom end of each of the base bars to provide means for attaching the base bar to the roof. Each of the teeth has an inclined surface and base end 8 to facilitate the teeth engaging Within the roof structure and to prevent the same slipping therefrom.

lA. seat 9 is provided. The seat 9 is hinged to the respective base bars by hinge pins I9 and II. The hinging connection is afforded by suitable lugs I2 and I3 with the respective lugs being secured to the under side of the seat 9. The hinging pins I0 and II pass through the top edge of the base bar and through the respective lugs.

The seat is cushioned by suitable material I4 and a cover I5 maintains the cushioning material in place and in position.

Struts I5 and I'I are provided. Lugs I8 and I9 are secured to the under side of the seat 9. Hinge pins 29 and 2| pass through the respective lugs I8 and I9 and through the top end of the struts I6 and I'I.

A plurality of spaced holes 22 are disposed within the web of each of the base bars. A carrier tube 23 is provided. The carrier tube 23 has a pair of locking bolts 24 and 25 associated with each of the ends of the carrier tube. The locking bolts are adapted for being retracted into the tube and for being moved outwardly relative to the tube to engage within the respective holes 22 and maintain the seat 9 in desired elevated position or in desired lowered position or at the required angle.-

A manipulating lever 25 is provided. The lever 26 is hinged relative to the tube 23 by a journal pin 21. Links 28 and 29 are hingedly secured to the lever 26 by hinge pins 39 and 3|. The links 2B and 29 are connected to the respective locking bolts 26 and 25 by hinge pins 32 and 33.

A pair of reactance elements as coil springs 34 and 35 are disposed between the inner ends of the respective locking bolts 24 and 25 and the central hinge pin 21. The purpose of the springs 1s to normally maintain the locking bolts in extended position and in place within the respective holes 22 disposed within the base bars.

When it is desired to retract the locking bolts, the lever 26 is moved into raised position to thereby retract the bolt and to permit the folding of the seat, or the changing of the same to the desired elevation or to the desired angle.

The spacing of the base end of the base bars is accomplished through the use of a cross bar 36. The cross bar 35 is secured upon its respective ends to the base bars I and 2.

While the form of mechanism herein shown and described is admirably adapted to fulll the objects primarily stated, it is to be understood that it is not intended to conne the invention to the embodiment herein shown and described, as it is susceptible of embodiment in various forms, all coming within the scope of the claims which follow.

What I claim is:

1. An adjustable roof jack, comprising in combination, a pair of base bars, with each of the base bars being offset adjacent their ends, teeth disposed on the roo-f engaging underside of each of the offset ends, a seat, the seat being hingedly secured to the same ends of each of the base bars, a pair of struts hingedly secured to the swinging edge of the seat member, spaced holes disposed in the intermediate portion of each of the base bars, a carrier tube, pairs of locking bolts disposed in the opposite ends of the carrier tube and adapted for being moved longitudinally of the carrier tube, reactanee means for normally maintaining each of the locking bolts extended relative to the carrier tube, a manipulative lever hingedly secured to the carrier tube and a link connecting each of the locking bolts With the lever.

2. An adjustable roong jack, comprising in combination, a pair of base bars, roof engaging teeth disposed on the underside and adjacent Fil each end of each of the base bars, spaced hooks disposed in each of the base bars and a seat hingedly secured tothe same end of each of the base bars, with the edge of the seat opposite to that Where hinged, a carrier tube carrying a pair of supporting struts that are hingedly secured to the seat and to a carrier tube on their opposite ends, a carrier tube, locking bolts carried in the opposite ends of the carrier tube, and a handle hingedly secured to the carrier tube, said handle being connected by suitable links to the locking bolts for movement into and out of spaced holes disposed in the base bars.

3. A roof jack comprising in combination, a pair of base bars, said base bars being fashioned on their underside to engage a roof and to prevent slippage relative thereto, a seat hingedly secured at one of its edges to the base bars, spaced holes disposed in each of the base bars, a carrier tube, links hingedly connecting the seat With the carrier tube, locking bolts associated With the carrier tube and adapted for locking entry into the holes disposed in the base bars and a handle common to each of the locking bolts and adapted for moving the locking bolts out of and into locking engagement with the holes disposed in the base bars.

JOSEPH J. INGRAM. 

